复合膜用PUA黏合剂的合成与性能

Synthesis and Properties of PUA Adhesives for Laminated Plastics Films

以丙烯酸酯单体为原料,水性聚氨酯为种子乳液和高分子乳化剂,合成了核-壳结构的聚氨酯-丙烯酸酯复合乳液.采用傅里叶红外光谱表征了反应产物的结构.研究丙烯酸酯与聚氨酯质量比、丙烯酸酯软硬单体质量比对复合乳液性能、胶膜耐水性、热稳定性及180°剥离强度的影响.结果表明:随丙烯酸酯与聚氨酯质量比和丙烯酸酯硬单体质量的增加,复合乳液黏度减小,粒径增大,胶膜耐水性和热稳定性提高.当丙烯酸酯与聚氨酯质量比为2.0,丙烯酸酯软单体与硬单体质量比为75/25时,聚氨酯-丙烯酸酯复合乳液黏合剂对双向拉伸聚丙烯/铝箔的粘接强度优于国外样品.

Acrylates and waterborne polyurethane （ WPU ） were selected respectively as monomer and seed emulsion and polymer emulsifier to prepare polyurethane-acrylate （ PUA ） hybrid emulsion with core-shell structure. The structure of the PUA was characterized by FTIR spectrum. The influence of the mass ratios of PA to PU and soft monomer to hard monomer in PA on the PUA latex performance, 180° peel strength of BOPP with aluminum, the film water-resistance and thermstabil- ity were investigated. The results show that with the increases of mass ratio of PA to PU and mass of hard monomer in PA, the viscosity of the hybrid emulsion decreases, particle size increases, the water resistance and thermal property of film are improved. When the mass ratio of PA to PU is 2.0, soft monomer to hard monomer of PA is 75 to 25, the bonding strength of BOPP/aluminum foils is superior to the sample abroad.